At 2,197 meters (7,208 feet) the Krubera cave is the deepest on Earth. Located in the Arabika Massif, of the Western Caucasus in Abkhazia, Georgia, it extends for 13.432 kilometers (8,346 miles.) I would love to get inside, but I know the fear would paralyze me. I love to go through its complete (so far) map, though. »3/28/14 2:57am 3/28/14 2:57am

I knew I was going to freak out when I clicked on this video of a man stuck in The Tube, a long thin passage in the Lost Johns' Cave—a large cave system on Leck Fell, Lancashire, England—as the water pours in and he panics. Fortunately, he escaped at the end. »3/25/14 11:57pm 3/25/14 11:57pm

Like all its documentaries, the BBC's Frozen Planet is fascinating and exquisitely filmed. Their crew has captured amazing things, including the creeping ice tornado. Unfortunately, they cheated on their viewers when they faked a crucial polar bear scene in a zoo. »12/12/11 3:07pm 12/12/11 3:07pm

Your Fruit Ninja high score is irrelevant. In fact, no game of Fruit Ninja that you've played in your life so far matters anymore, not now that a motion tracking system, 5.1 surround sound, and a Wiimote have given the popular mobile game this insane virtual reality iteration. The only thing the CAVE—the Cave… »3/28/11 11:00am 3/28/11 11:00am

In 1420, Venetian engineer Giovanni Fontana proposed an elaborate mechanical room he dubbed the Castellum Umbrarum, or "castle of shadows." Sound awesome? It is. In a recent paper, French professor Philippe Codognet described it as "a room with walls made of folded translucent parchments lighted from behind, creating… »2/22/11 3:20pm 2/22/11 3:20pm

That Kraft cheese slice you might chomp for lunch today? It came from a mammoth subterranean dairy bunker the company uses as dirt cheap refrigeration and storage, Wired reports. Inside a 70 year old mine that's still rocked by explosions. »2/01/11 12:00pm 2/01/11 12:00pm

Sixteen-year-old Alexander Kendrick has put together a low-frequency radio which allows for the transmission of text messages from caves nearly 1,000 feet underground. I still can't get a single bar of reception on the subway. »2/01/10 6:40pm 2/01/10 6:40pm

UC at San Diego has the closest thing to an X-Men-style Danger Room in its new StarCAVE, a small room that entirely surrounds you, hurtling 68 million pixels at your eyeballs at near-perfect resolution. Pop on polarized glasses and the whole thing goes 3D. Grasping a wireless "wand," you can walk through tall…
»9/19/08 6:00pm 9/19/08 6:00pm

If the Javier Mariscal-designed Nido Play Cave had been around when we were kids, we would've promised anything to our mom—clean plates, good grades, law or medical school—and we would've meant it too, just to get our grubby hands on of these wonderfully cheery hideouts. If we had children, we'd get it for them;… »4/26/06 6:17pm 4/26/06 6:17pm